In the ingredient descriptions: Good means that I like to see this in a product's list of ingredients. Okay means this product appears safe for a curly person like me to use. Caution means that this ingredient may not be good in some hair care products, or for some people. Avoid means this ingredient may hurt your hair. If you see this ingredient in a hair product, it's best to put it down and walk away.

Benzoic acidOkay
Preservative that actually occurs naturally in barks such as cassia and cherry trees, as well as in raspberries, tea, and anise. Used in food flavorings. For some people it may cause allergic reactions [Winter (7th edition) pages 104-105]. However, this is in one of my favorite, go to conditioners that I've been using for well over ten years. It has not caused any problems as far as conditioning and defining my hair. That's why I'm calling it a